The Dolos Quick Detach Barrel System is one the most revolutionary Ar 15 parts we’ve ever seen. It takes the modular AR 15 and makes the black rifle even more customizable, easier to use, and more compact. It allows builders to build a true takedown AR 15, allowing for barrel changes and caliber swaps in literal seconds. The Dolos Quick Barrel System has innovated and truly introduced a new concept into a boring market. If you’re intimidated by having to install it, it’s actually fairly easy.